US7582252B2 - Plant with rotating furnace for the melting without salt of aluminum with screening and recovery of the slags - Google Patents

Plant with rotating furnace for the melting without salt of aluminum with screening and recovery of the slags Download PDF

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Publication number
US7582252B2
US7582252B2 US10/542,530 US54253003A US7582252B2 US 7582252 B2 US7582252 B2 US 7582252B2 US 54253003 A US54253003 A US 54253003A US 7582252 B2 US7582252 B2 US 7582252B2
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United States
Prior art keywords
plant
furnace
melting
rotating
aluminum
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
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US10/542,530
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English (en)
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US20060273498A1 (en
Inventor
Antonio Spoleto
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Hitech Srl
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Hitech Srl
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Assigned to HITECH S.R.L. reassignment HITECH S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPOLETO, ANTONIO
Publication of US20060273498A1 publication Critical patent/US20060273498A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/066—Treatment of circulating aluminium, e.g. by filtration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
    • F27B3/045—Multiple chambers, e.g. one of which is used for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/06—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement
    • F27B3/065—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement tiltable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
    • F27B7/161—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising projections jutting out from the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/33—Arrangement of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • F27D3/145—Runners therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • An object of the present invention is a modular plant for the melting of metallic materials, especially aluminium scraps, comprising a rotating furnace characterized by the lack of use of a salty bath, and with direct pouring of the melted metal in a spherical storage tank, an equipment for the selection and recovery of the slag of fusion, and a system of scavenging.
  • Salt is a good receiver and transmitter of heat and its addition is useful as a cover agent to prevent the oxidation of the metal in the fusion. At almost 1000° C. it reacts, englobing the slag of fusion of the aluminium scraps.
  • the principal drawback of these furnaces is the production of a notable quantity of refuse, essentially constituted by the salty products mixed to the slag of the process of fusion of the aluminium scrap. Problems exist because of the disposal of this fuse. Recycling the refuse is not always possible or convenient from an economic point of view, and impacts the final price of the ingot of aluminium.
  • the present invention avoids the drawbacks of the preceding systems primarily by use of a rotating furnace for the fusion of primary and secondary aluminium that does not have to realize the fusion of the aluminium using a salty bath.
  • Another is the realization of a rotating furnace for the fusion of the primary and secondary aluminium, according with the preceding purposes, in which it is the direct and continuous pouring of the fused metal in a spherical store tank without any interruption of the process of fusion, so that to improve the use of fuel, of workforce, of salty materials, and the safety conditions of the job.
  • FIG. 1 shows, in a three-dimensional way, the general view of the system of fusion according to the present invention.
  • FIG. 2 shows, in a perspective section, the general view of the system of fusion according to the present invention.
  • FIG. 3 shows a longitudinal section of the general view of the system of fusion according to the present invention.
  • FIG. 4 shows, schematically and in a lateral point of view, a portion of the spiral element with the channels realized on it.
  • FIG. 5 shows, in a lateral longitudinal view, the equipment for treating of the slag with a disposition for the scavenging as well as tracks for moving.
  • FIG. 6 shows, schematically and in a general view, components of the plant, mainly the store tank of the fused metal and the system of scavenging.
  • the furnace that realizes the fusion of the primary and secondary aluminium scraps is constituted by a cylindrical hollow body ( 1 ), with circular section, built in a refractory material, resistant to thermal stress.
  • the body ( 1 ) is closed by a porthole ( 2 ) used for the loading of the metallic scraps.
  • a window of entry ( 3 ) is provided for the flame of heat of the scrap.
  • a hole ( 4 ) is provided for the leakage of the fused liquid that, as illustrated by the drawings, is realized in a plain slot.
  • the inside diameter of the body ( 1 ) changes constantly along its longitudinal axis to originate a negative inclination on the horizontal line beginning from the extremity at the loading porthole ( 2 ) up to the extremity where is positioned the hole ( 4 ) for leakage of the melted metal.
  • the difference of inclination among the two extremities, in comparison to the horizontal line, is 2 centimeters per linear meter of the length of the furnace.
  • the furnace is covered by a metallic structure and is kept in a horizontal position by metallic traverse frames ( 5 ) that place and creep on the slides ( 6 ) held on the metallic supports ( 7 ).
  • openings ( 8 ) and ( 9 ) for scavenging the fumes that join in a single channel of evacuation ( 10 ).
  • a spiral element ( 11 ) is provided, whose spires, in a first preferred and illustrated shape, are cylindrical, with circular section, with constant diameter and made of a refractory material resistant to the heat and to the mechanical stress due to the action of the scrap in fusion.
  • the basin ( 16 ) has adequately been described in the patent WO 02/39044 by the same applicant.
  • the rotating joint ( 17 ), in comparison to that described in the aforesaid patent, has a different shape, so as to realize a continuity of inclination with the channel of pouring ( 13 ).
  • the furnace is maintained in a slow rotation, from one to four revolution/minute, on its mean axle by a gear motor.
  • the melting of secondary aluminium is preferred, at first is realized the selection and mixing of different types of aluminium scraps, whose chemical composition has to be as close as possible to that of the desired alloy. Then the aluminium scraps are set, through the loading porthole ( 2 ), in the rotating furnace without adding of sodium chloride as a cover agent to prevent the oxidation of the metal.
  • the liquid metal is protected against the oxidation of the air because of its low position, it is not directly licked up by the stream of the warm gases (whose flow is horizontal and situated in the tall part of the furnace), as well as because it continually flows in the basin ( 16 ) where the fused metal is stored, through the pouring channel ( 13 ).
  • the slags remain in the tall part and are held by the spiral body ( 11 ) and, once all the aluminium is melted and has been stored in the spherical basin, are discharged close to the loading porthole through a channel equipped with a screw conveyor, finishing the process of melting.
  • the slags put in the channel and pushed by the screw conveyor, reaches the module of selection wherein they enter from the extremity ( 18 ).
  • the module of selection is constituted by three hollow metallic and coaxial cylinders, one inserted in the other, and open to the left end, and is kept in a horizontal position by booms ( 19 ) and metallic traverse frames ( 20 ) that place and creep on the slides ( 21 ) joined on metallic supports ( 22 ) with the interposition of a gear carriage ( 23 ).
  • the cylinders ( 24 ) and ( 25 ) have a surface side equipped with holes, greater on the first cylinder ( 24 ) and smaller on the second ( 25 ) so that it is possible the pouring of slags of different dimensions.
  • the whole, constituted by the three cylinders, is put in slow rotation around the longitudinal axle, so a remixing of the slags occur as soon as they advance along the cylinders pushed by the screw conveyor.
  • the slag according to their weight and dimension, pass from the first cylinder ( 24 ) to the last one ( 26 ).
  • the slags essentially constituted by iron parts, steel, copper, that is, material that has not been put through the process of fusion or only been put through a small amount; in the second cylinder ( 25 ) are the slags of aluminium oxide, while in the third cylinder ( 26 ) are essentially the dusts. It is very interesting to note that the slags, flowing, are selected as well as they are cooled.
  • the recovered aluminium oxide is recycled and joined to the feeding charge of fusion. All of the exhaust gases produced in the module of selection and recovery of the slag are carried, through canalizations, to the cap ( 30 ), and do not escape in the external environment.
  • module of selection and recovery of the slag is constituted by units, placeables on tracks, ( 31 ), so that they can be open for inspections and maintenance.
  • the furnace of fusion is also modular, put on carriages that are moved on tracks, to make possible the opening.
  • the warm gases originated by the furnace of fusion at a maximum temperature of 300° C., are carried through the pipeline ( 32 ) in the underground pit ( 33 ) accessible by a porthole of inspection ( 34 ).
  • the gases exclusively escape from the furnace of fusion, because of the concomitant action due to the kinetic energy (that originates from their heat), to the expansion that they have by reaching the pit ( 33 ), to the loss of pressure produced by the chimney ( 35 ) and to the drag force produced by the air flow, at a great speed, that escapes from the extremity ( 36 ) of the pipeline ( 37 ).
  • the warm gases because of the expansion, decrease in temperature and also realize a first falling of the heaviest particles of pollutant agents in the gases.
  • Both pipelines ( 32 ) and ( 37 ) are equipped with a control valve ( 39 ) for automatic passage of the gases.
  • the present system realizes also an energetic conservation in the furnace of fusion, because the gases are evacuated in a natural way and only in the quantity necessary to the process of combustion, not having additional quantities of heat for an excess of evacuation of the gases.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Processing Of Solid Wastes (AREA)
  • Seasonings (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Electrolytic Production Of Metals (AREA)
US10/542,530 2003-01-16 2003-12-30 Plant with rotating furnace for the melting without salt of aluminum with screening and recovery of the slags Expired - Fee Related US7582252B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT2003SA000004 ITSA20030004A1 (it) 2003-01-16 2003-01-16 Sistema a forno rotante per la fusione senza sale di materiali metallici.
ITSA2003A000004 2003-01-16
PCT/IT2003/000862 WO2004063653A1 (en) 2003-01-16 2003-12-30 Plant with rotating furnace for the melting without salt of aluminium with screening and recovery of the slags

Publications (2)

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US20060273498A1 US20060273498A1 (en) 2006-12-07
US7582252B2 true US7582252B2 (en) 2009-09-01

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US10/542,530 Expired - Fee Related US7582252B2 (en) 2003-01-16 2003-12-30 Plant with rotating furnace for the melting without salt of aluminum with screening and recovery of the slags

Country Status (14)

Country Link
US (1) US7582252B2 (de)
EP (1) EP1608926B1 (de)
JP (1) JP4494220B2 (de)
CN (1) CN100465565C (de)
AT (1) ATE366400T1 (de)
AU (1) AU2003295224B2 (de)
CA (1) CA2514894A1 (de)
DE (1) DE60314780T2 (de)
ES (1) ES2290533T3 (de)
IT (1) ITSA20030004A1 (de)
PT (1) PT1608926E (de)
RU (1) RU2353681C2 (de)
WO (1) WO2004063653A1 (de)
ZA (1) ZA200505660B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1396275B1 (it) 2009-11-09 2012-11-16 Hitech S R L Impianto di fonderia di leghe di alluminio, completamente modulare.
CN103602817A (zh) * 2013-11-13 2014-02-26 安徽省金盈铝业有限公司 再生铝高低双炉低温预除杂工艺

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798500A (en) * 1919-02-01 1931-03-31 C H Ellsworth Rotary kiln
US2165128A (en) * 1938-04-22 1939-07-04 Traylor Engineering And Mfg Co Rotary kiln
US2223569A (en) * 1931-08-17 1940-12-03 Lohse Julius Process and apparatus for the direct recovery of heavy metals of the nonferrous group from ores and other primary materials
US3228670A (en) * 1963-01-23 1966-01-11 R N Corp Methods and apparatus for ore reduction and processing of other chemically reactive aggregates
US4010935A (en) 1975-12-22 1977-03-08 Alumax Inc. High efficiency aluminum scrap melter and process therefor
US4491473A (en) 1983-11-18 1985-01-01 Aluminum Company Of America Method of operating metallic scrap treating furnace to fragment and segregate metallic components therein
EP0400925A2 (de) 1989-05-29 1990-12-05 Alcan International Limited Verfahren und Anlage zum Schmelzen verunreinigter metallischer Abfälle
JPH10244241A (ja) 1997-03-05 1998-09-14 Mitsubishi Alum Co Ltd アルミニウムドロス残灰の処理方法
DE20013042U1 (de) 2000-07-28 2000-12-21 Sug Schmelz Und Giesanlagen Gm Drehtrommelofen
WO2002039044A2 (en) 2000-11-13 2002-05-16 Antonio Spoleto Melting furnace for metal leagues fit to the direct and continuous poured of the melted metal
WO2002101309A1 (en) 2001-06-08 2002-12-19 Catalano, Adriana An apparatus for the extraction of metallic magnesium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3335870B2 (ja) * 1997-03-28 2002-10-21 株式会社クボタ 回転胴式加熱処理装置
JP4027592B2 (ja) * 2000-12-28 2007-12-26 株式会社栗本鐵工所 空缶処理方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798500A (en) * 1919-02-01 1931-03-31 C H Ellsworth Rotary kiln
US2223569A (en) * 1931-08-17 1940-12-03 Lohse Julius Process and apparatus for the direct recovery of heavy metals of the nonferrous group from ores and other primary materials
US2165128A (en) * 1938-04-22 1939-07-04 Traylor Engineering And Mfg Co Rotary kiln
US3228670A (en) * 1963-01-23 1966-01-11 R N Corp Methods and apparatus for ore reduction and processing of other chemically reactive aggregates
US4010935A (en) 1975-12-22 1977-03-08 Alumax Inc. High efficiency aluminum scrap melter and process therefor
US4491473A (en) 1983-11-18 1985-01-01 Aluminum Company Of America Method of operating metallic scrap treating furnace to fragment and segregate metallic components therein
EP0400925A2 (de) 1989-05-29 1990-12-05 Alcan International Limited Verfahren und Anlage zum Schmelzen verunreinigter metallischer Abfälle
JPH10244241A (ja) 1997-03-05 1998-09-14 Mitsubishi Alum Co Ltd アルミニウムドロス残灰の処理方法
DE20013042U1 (de) 2000-07-28 2000-12-21 Sug Schmelz Und Giesanlagen Gm Drehtrommelofen
WO2002039044A2 (en) 2000-11-13 2002-05-16 Antonio Spoleto Melting furnace for metal leagues fit to the direct and continuous poured of the melted metal
WO2002101309A1 (en) 2001-06-08 2002-12-19 Catalano, Adriana An apparatus for the extraction of metallic magnesium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Unlu, N. et al., "Comparison of salt-free aluminum dross treatment processes," Resources Conservation and Recycling, Elsevier Science Publisher, Amsterdam, NL, vol. 36, No. 1, Jul. 2002, pp. 61-72.

Also Published As

Publication number Publication date
EP1608926A1 (de) 2005-12-28
ITSA20030004A0 (it) 2003-01-16
ATE366400T1 (de) 2007-07-15
US20060273498A1 (en) 2006-12-07
DE60314780T2 (de) 2008-04-10
PT1608926E (pt) 2007-10-17
RU2353681C2 (ru) 2009-04-27
DE60314780D1 (de) 2007-08-16
CN1745287A (zh) 2006-03-08
JP4494220B2 (ja) 2010-06-30
AU2003295224B2 (en) 2009-08-27
ES2290533T3 (es) 2008-02-16
AU2003295224A1 (en) 2004-08-10
WO2004063653A1 (en) 2004-07-29
CN100465565C (zh) 2009-03-04
EP1608926B1 (de) 2007-07-04
ITSA20030004A1 (it) 2004-07-17
RU2005121488A (ru) 2006-02-10
CA2514894A1 (en) 2004-07-29
ZA200505660B (en) 2006-03-29
JP2006513321A (ja) 2006-04-20

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